X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 10 Oct 2007 12:23:54 -0400 Message-ID: X-Original-Return-Path: <5zq@cox.net> Received: from eastrmmtao106.cox.net ([68.230.240.48] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2379307 for lml@lancaironline.net; Wed, 10 Oct 2007 10:21:46 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.240.48; envelope-from=5zq@cox.net Received: from eastrmimpo02.cox.net ([68.1.16.120]) by eastrmmtao106.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071010142107.LKYI25350.eastrmmtao106.cox.net@eastrmimpo02.cox.net> for ; Wed, 10 Oct 2007 10:21:07 -0400 Received: from bh1 ([72.209.225.157]) by eastrmimpo02.cox.net with bizsmtp id yeM61X00X3QP3uo0000000; Wed, 10 Oct 2007 10:21:06 -0400 X-Original-Message-ID: <01eb01c80b48$cc0687b0$6401a8c0@bh1> From: "Bill & Sue" <5zq@cox.net> X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] IVP accumulator question X-Original-Date: Wed, 10 Oct 2007 10:21:06 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01E8_01C80B27.44CEC210" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 x-mimeole: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_01E8_01C80B27.44CEC210 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable HOLD ON DAN! Be very careful with the accumulator. Accumulators have = what is known as a "precharge" probably somewhere in the neighborhood of = 1000 psi. This charge will be in the top side even when the bottom side = is at zero pressure. Make damn sure that you're not screwing out = something with 1000 psi behind it. To remove the accumulator from the = plane, you should just have to bleed the HYDRAULIC pressure to zero on = the bottom side. No AIR bleeding should be necessary. If necessary, the = precharge should be refilled to the recommended pressure with nitrogen. = Check with Lancair for the recommended pressure. Hope this helps. Bill Harrelson N5ZQ 320 1,400 hrs N6ZQ IV under construction ----- Original Message -----=20 From: Dan Reagan=20 To: lml@lancaironline.net=20 Sent: Wednesday, October 10, 2007 9:02 AM Subject: [LML] IVP accumulator question Recently I have noticed that the hydraulic pump seems to cycle more = than usual when the flaps are going into the down position. Going down = it cycles once every second for about 6 seconds. Going up it cycles one = time. =20 I am trying to check the accumulator pressure but it looks like I am = going to have to take the accumulator out of the plane to do this since = the end cap which protects the schrader valve won't easily turn. Before = I started the disassembly process I thought I would get some opinions = and advice on if there is a problem and what to do about it. Also, with the hydraulic pump breaker pulled, the pressure in the = accumulator will cycle the flaps to the opposite position but not much = more. My thinking is that the accumulator is not totally bad but just = has low pressure. If I remove the accumulator for maintenance, what air bleeding will I = have to do? Any advice and help would be appreciated. Dan Reagan IVP 450+ hours Cincinnati ------=_NextPart_000_01E8_01C80B27.44CEC210 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
HOLD ON DAN! Be very careful with the = accumulator.=20 Accumulators have what is known as a "precharge" probably somewhere in = the=20 neighborhood of 1000 psi. This charge will be in the top side even = when the=20 bottom side is at zero pressure. Make damn sure that you're not screwing = out=20 something with 1000 psi behind it. To remove the accumulator from the = plane, you=20 should just have to bleed the HYDRAULIC pressure to zero on the bottom = side. No=20 AIR bleeding should be necessary.  If necessary, the precharge = should be=20 refilled to the recommended pressure with nitrogen. Check with Lancair = for the=20 recommended pressure.  Hope this helps.
 
Bill Harrelson
N5ZQ 320 1,400 hrs
N6ZQ  IV  under = construction
 
 
----- Original Message -----
From:=20 Dan = Reagan
Sent: Wednesday, October 10, = 2007 9:02=20 AM
Subject: [LML] IVP accumulator=20 question

Recently I have noticed that the = hydraulic pump=20 seems to cycle more than usual when the flaps are going into the down=20 position.  Going down it cycles once every second for about 6=20 seconds.  Going up it cycles one time. 
 
I am trying to check the accumulator = pressure but=20 it looks like I am going to have to take the accumulator out of the = plane to=20 do this since the end cap which protects the schrader valve won't = easily=20 turn.  Before I started the disassembly process I thought I would = get=20 some opinions and advice on if there is a problem and what to do about = it.
 
Also, with the hydraulic pump breaker = pulled, the=20 pressure in the accumulator will cycle the flaps to the opposite = position but=20 not much more.  My thinking is that the accumulator is not = totally bad=20 but just has low pressure.
 
If I remove the accumulator for = maintenance, what=20 air bleeding will I have to do?
 
Any advice and help would be=20 appreciated.
 
Dan Reagan
IVP 450+ hours
Cincinnati
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